Jh. Xu et al., MINERALOGICAL AND WALLROCK ALTERATION AT THE JINQINGDING GOLD DEPOSITIN JIAODONG PENINSULA, CHINA, Exploration and mining geology, 3(1), 1994, pp. 1-8
The Jinqingding gold deposit, situated in the east Jiaodong Peninsula
of Shandong province, is typical of the pyrite-quartz vein gold deposi
ts in the Muping-Rushan gold belt of China. The gold deposit is contro
lled by a great NNE fracture zone and is composed of several lenticula
r orebodies within the fracture zone occurring in the Kunyushan granit
e massif. The Kunyushan granite massif was formed by the replacement o
f the Archean Jiaodong group. The main minerals associated with gold a
re pyrite, chalcopyrite, galena and sphalerite; the gangue minerals ar
e dominated by quartz, sericite, microcline and calcite. The mineraliz
ing event can be divided into four stages: (1) pyrite-quartz; (2) quar
tz-pyrite; (3) siderite-polymetallic sulfides; and (4) calcite-quartz.
Gold occurs mainly as native gold and electrum in stage I and stage I
I. There are some evident differences between pyrite from major stages
of gold mineralization and that from minor stages; these include diff
erences in crystal forms, size and composition of fluid inclusions. Wa
llrock alterations consist of sericitization, silicification, pyritiza
tion and potash-feldspar alteration. Five alteration zones can be dist
inguished from unaltered granite (zone 0) to vein lodes (zone IV). Au
and Ag increase rapidly from zone 0 to zone IV, Cu increases continuou
sly, while Pb and Zn increase slowly. R-type geological factor analysi
s indicates that the Au, Ag, Cu, Pb and Zn bear a close relationship t
o wallrock alteration.